Rheologically active urea urethane compounds
AssigneeBYK-Chemie GmbH
InventorsKarlheinz Haubennestel, Ulrich Orth, Axel Woocker, Heribert Holtkamp, Christoph Buchmann
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Abstract
The invention relates to a process for preparing a solution which comprises urea urethanes and is effective as a thixotropic agent, which involves reacting at least two structurally different monohydroxy compounds with an excess of toluene diisocyanate to form monoisocyanate adducts, removing the unreacted portion of the toluene diisocyanate, and reacting the resultant monoisocyanate adducts with diamines in an aprotic solvent in the presence of a lithium salt to form urea urethanes. The invention also relates to the use of the solution to receive thixotropic coating compositions.
Claims20
A process for preparing a compound having formula (II)
- comprising reacting a mixture of monoisocyanate compounds having formulas (II) and (III):
- with a diamine having the formula H2N—R3—NH2 or
- wherein R1 and R2 are independently C4-22alkyl, C3-18alkenyl, C3-8cycloalkyl, arylC1-8alkyl, or a group having the formula —CmH2m+1(O—CnH2n)x, —CmH2m+1(OC(O)—CvH2v)x or —Z—C6H4(O—CnH2n)x;
- wherein Z is C1-12alkylene;
- R3 is —CiH2i—, —(CpH2p—O—CpH2p)q,
- or a mixture thereof;
- and
- R4 is CH3 or hydrogen;
- wherein i is from about 2 to about 12;
- p is from about 2 to about 4;
- q is from 1 to about 10;
- m is 1-22;
- n is 2-4;
- x is 1-15;
- and v is 4 or 5;
- in an aprotic solvent in the presence of a lithium salt;
- provided that R1 and R2 are different.
A compound having formula (II)
- wherein
- R1 and R2 are independently C4-22alkyl, C3-18alkenyl, C3-8cycloalkyl, arylC1-8alkyl, or a group having the formula —CmH2m+1(O—CnH2n)x, —CmH2m+1(OC(O)—CvH2v)x or
- —Z—C6H4(O—CnH2n)x;
- Z is C1-12alkylene;
- R3 is —CiH2i—, —(CpH2p—O—CpH2p)q,
- or a mixture thereof;
- and
- wherein
- R4 is CH3 or hydrogen;
- i is from about 2 to about 12, p is from about 2 to about 4, q is from 1 to about 10, m is 1-22, n is 2-4, x is 1-15, and v is 4 or 5;
- provided that R1 and R2 are different.
Dependencies are inferred from the claim text.